How many millimeters are in 1 foot?

1 ft equals 304.8 mm. This is an exact conversion factor defined by NIST.

How do I convert feet to millimeters?

Multiply the value in ft by the conversion factor. For example, 10 ft = 3048 mm. Use our calculator above for instant results.

Is the feet to millimeters conversion exact?

Yes, this conversion is mathematically exact based on the international definition of these units (NIST SP 811).

Can I convert feet to millimeters offline?

Yes! OmniConvert runs entirely in your browser — no internet connection needed after the page loads. Your data never leaves your device, ensuring complete privacy.

What is the difference between feet and millimeters?

Feet (ft) and Millimeters (mm) are both units of length but belong to different measurement systems. 1 ft = 304.8 mm. Use the converter above to switch between them instantly.

Feet to Millimeters (ft → mm) — Free Online Converter

ft → mm Reference Table

ft	mm
0.001 ft	0.3048 mm
0.002 ft	0.6096 mm
0.003 ft	0.9144 mm
0.004 ft	1.2192 mm
0.005 ft	1.524 mm
0.006 ft	1.8288 mm
0.007 ft	2.1336 mm
0.008 ft	2.4384 mm
0.009 ft	2.7432 mm
0.01 ft	3.048 mm
0.02 ft	6.096 mm
0.03 ft	9.144 mm
0.04 ft	12.192 mm
0.05 ft	15.24 mm
0.06 ft	18.288 mm
0.07 ft	21.336 mm
0.08 ft	24.384 mm
0.09 ft	27.432 mm
0.1 ft	30.48 mm
0.2 ft	60.96 mm
0.3 ft	91.44 mm
0.4 ft	121.92 mm
0.5 ft	152.4 mm
0.6 ft	182.88 mm
0.7 ft	213.36 mm
0.8 ft	243.84 mm
0.9 ft	274.32 mm
1 ft	304.8 mm
1.5 ft	457.2 mm
2 ft	609.6 mm
2.5 ft	762 mm
3 ft	914.4 mm
3.5 ft	1066.8 mm
4 ft	1219.2 mm
4.5 ft	1371.6 mm
5 ft	1524 mm
5.5 ft	1676.4 mm
6 ft	1828.8 mm
6.5 ft	1981.2 mm
7 ft	2133.6 mm
7.5 ft	2286 mm
8 ft	2438.4 mm
8.5 ft	2590.8 mm
9 ft	2743.2 mm
9.5 ft	2895.6 mm
10 ft	3048 mm
11 ft	3352.8 mm
12 ft	3657.6 mm
13 ft	3962.4 mm
14 ft	4267.2 mm
15 ft	4572 mm
16 ft	4876.8 mm
17 ft	5181.6 mm
18 ft	5486.4 mm
19 ft	5791.2 mm
20 ft	6096 mm
25 ft	7620 mm
30 ft	9144 mm
35 ft	10668 mm
40 ft	12192 mm
45 ft	13716 mm
50 ft	15240 mm
55 ft	16764 mm
60 ft	18288 mm
65 ft	19812 mm
70 ft	21336 mm
75 ft	22860 mm
80 ft	24384 mm
85 ft	25908 mm
90 ft	27432 mm
95 ft	28956 mm
100 ft	30480 mm
120 ft	36576 mm
125 ft	38100 mm
130 ft	39624 mm
140 ft	42672 mm
150 ft	45720 mm
160 ft	48768 mm
175 ft	53340 mm
180 ft	54864 mm
200 ft	60960 mm
225 ft	68580 mm
250 ft	76200 mm
275 ft	83820 mm
300 ft	91440 mm
350 ft	106680 mm
400 ft	121920 mm
450 ft	137160 mm
500 ft	152400 mm
600 ft	182880 mm
700 ft	213360 mm
750 ft	228600 mm
800 ft	243840 mm
900 ft	274320 mm
1000 ft	304800 mm
1200 ft	365760 mm
1250 ft	381000 mm
1500 ft	457200 mm
1750 ft	533400 mm
2000 ft	609600 mm
2500 ft	762000 mm
3000 ft	914400 mm
4000 ft	1219200 mm
4500 ft	1371600 mm
5000 ft	1524000 mm
6000 ft	1828800 mm
7000 ft	2133600 mm
7500 ft	2286000 mm
8000 ft	2438400 mm
9000 ft	2743200 mm
10000 ft	3048000 mm
15000 ft	4572000 mm
20000 ft	6096000 mm
25000 ft	7620000 mm
50000 ft	15240000 mm
75000 ft	22860000 mm
100000 ft	30480000 mm

Values based on NIST SP 811 conversion factors

Why Convert Feet to Millimeters?

Converting between feet (ft) and millimeters (mm) is one of the most common length conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert ft to mm saves time and prevents errors.

Length conversions between ft and mm are fundamental in construction, manufacturing, and international trade. Architects rely on precise conversions when adapting building plans between metric and imperial standards — a 1% error on a 30-meter wall translates to 30 cm of misalignment. Travelers frequently convert between kilometers and miles for road trips, while online shoppers need length conversions to verify clothing sizes, furniture dimensions, and screen diagonals across international retailers. In athletics, track distances (100m, 1500m, marathon) must be precisely converted for record comparisons across different measurement traditions.

How to Convert Feet to Millimeters

To convert feet to millimeters, use the following formula:

mm = ft × 304.8

Example: 1 ft = 304.8 mm

For example, 5 ft = 1524 mm, 10 ft = 3048 mm, and 100 ft = 30480 mm. For larger values, 1000 ft = 304800 mm. Conversely, 1 mm = 0.003280839895 ft. Our calculator above performs this conversion instantly with full precision — no rounding errors.

Common Mistakes to Avoid

Confusing similar units: confusing nautical miles with regular miles, or yards with meters.
Decimal errors: moving the decimal point the wrong way (e.g., 100 cm = 1 m, not 10 m).
Approximation: assuming an inch is exactly 2.5 cm (it's 2.54 cm).

Pro Tips

Use 'approx' for mental math: 1 km is roughly 0.6 miles (or 2/3 for quick estimates).
Visualize: A meter is about a guitar length; an inch is a thumb width.
Ruler check: Most rulers show cm and inches together—great for quick checks.

What is a Foot?

The foot (ft) is a unit of length in the Imperial and US customary systems. It is historically based on the human foot size. Since the International Yard and Pound Agreement of 1959, one foot has been exactly defined as 0.3048 meters.

Feet are primarily used in the United States, United Kingdom, and Canada. Common applications include measuring height, building dimensions, real estate, and aviation altitude.

What is a Millimeter?

The millimeter (mm) is a metric unit of length equal to one-thousandth of a meter (0.001 m). It is a standard unit in the International System of Units (SI).

Millimeters are used for precision engineering, manufacturing dimensions, rainfall measurement, and paper sizes (ISO 216). It represents small scale accuracy.

Feet → Millimeters

Feet to Millimeters Formula